Plant Moisture Stress - Symptoms and Solutions

I've also got a problem of my own on my hands, I'm hoping someone can help me!!

I've got a 15 plant limit, no rules on how many in flower at a time just 15 total root systems and plan on putting them in a 16x7x7 shipping container that's insulated to withstand temps in the -30 to -40°C and am definitely taking notes on cleanliness.

I recently just purchased a 1000W HPS that Im using in a 2x4x7 closet that is running AC to the bottom of the Grow box (that's within the closet) and allowing to rise to the ceiling along with 2 CPU fans and a little area fan to circulate the air best as I can. Temp stays at about 26°C with a 30% RH with the lights on, with the lights off it stays at 20°C with a 50-55% RH.

Previous to putting an AC unit in the closet there was just the fans, exceeding temps of over 30°C and having a RH of close to 60% and I would say for a good day, causing enough heat stress to
slightly taco my lady's leaves, the blades are coming up but the leaves aren't necessarily 'cupping'.

My question is, is this cupping reversible if I'm able to keep the temps controlled at the current ~26°C/30% DAY vs. ~20°C/50% NIGHT? Is there any way to reverse cupping?

I've got one super auto NL that's about 3.5 feet tall (having to bend her over because the lights too intense) that's under the 1000W she's on her 8th week of life out of about "10-12". Buds are forming nicely but they have a bit of a damp smell to them. I've inspected every little bit between her and there is absolutely no sign of mold, just that wet towel smell. I'm a little lost there also but it must have something to do with the humidity. Some leaves also have some yellow spotting I'm assuming due to that one bad heat wave they endured when I first got my light.

I'm just trying to get dense, good smelling nugs because I have the power just not necessarily the skill, and that's why I'm reaching out to those who do!

Here's a picture to get a better sense of what I'm dealing with, unfortunately my set up is super ghetto at home since I'm spending literally all my money on insulating those shipping containers for the harsh Canadian winters so please bare I appreciate you all in helping out in the medical and recreational cannabis communities, especially for Canadians at least it's not easy to find this information freely available from someone with experience!!

PS: this is my first grow! Please shoot out any constructive criticism! Just please don't be too too mean thanks again!!

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you want a ghetto hack? walmart sells these emergency blankets for a buck. will help with some reflectiveness. imho i think the 1000w is too big for area. you have . 5x5 is ideal for a 1000w. if you can exhaust the light do that if bat wing raise it to the highest , my first closet grow was similar to yours but 4x4x7 and i fought heat even with a ac. but 5k btu cooling per 1000w used should be gucci. and if you can bury the container,? lmk how things goes. im in colorado and it gets down to the -15s but not on a regular. ive done the 3/4" foam board with the reflective facing out with r30 batting framed with panda 10x20' space needed a 36k btu mini split with heat pump .and a Co2 burner. winning...

UB, What do you think is wrong with this plant? I had sprayed neem oil the day before, and after I woke up and the lights turn on, they were like this. I thought it would go away in a day, buit it didnt.

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I recently had issues with high humidity! My plants leaves started turning yellow in the middle and everything started to mildly wilt. I had a few leaves start to dampen off. I figured they needed a flush or something of the sort. To me it looked like they had some sort of deficiency or possibly a lock out. As I sat in the room thinking the moisture hit me right in the face. I brought my meter and holy fuck 100% humidity was choking out my plants. The stoma couldnt breath because of all the moisture. Never had I dealt with that nor realized that room had such high humidity...

Holy shit bro. Overnight? If I had to guess it looks like it didnt get enough water BUT if it happened overnight you might be looking at some sort of rodent or insect attacking the roots. That thing is DEAD something seriously attacked it or the root ball completely dried out. The wind could have possibly snapped the base of the stem or something I cant really get a good look with that picture. Maybe take one a little further out and one a little more close up... You didnt move it or anything recently did you? Dig into the roots and see what you find, I would guess maybe grubs cause gophers would have probably pulled the whole thing through.

I recently had issues with high humidity! My plants leaves started turning yellow in the middle and everything started to mildly wilt. I had a few leaves start to dampen off. I figured they needed a flush or something of the sort. To me it looked like they had some sort of deficiency or possibly a lock out. As I sat in the room thinking the moisture hit me right in the face. I brought my meter and holy fuck 100% humidity was choking out my plants. The stoma couldnt breath because of all the moisture. Never had I dealt with that nor realized that room had such high humidity...

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well I'm on a high climate and it's super dry (la national forest) and a storm did pass us these 2 days maybe the sudden air change

So i have 6 seedlings about 2-3wks old.
I started in jiffy pellets and everything was good, lots of roots showing out jiffy pellets so i transplanted into 3" pots sept 17.(watered)
1/2 promix bx and 1/2 promix hp
I watered once and seemed ok, waited until very light pots then watered again sept 21.
Seedlings started to droop n yellow. Waited til dry then watered again sept 21.
Now theyre browning n still drooping.

So i know i shoulda added more perlite and need to fix.

QUESTION- should i ride it out n just make sure they go fully dry for a day or two before watering again?
OR - should i pull em and re-plant w added perlite? If so, do i get old dirt off roots and plant in same pots or just move to slightly bigger pots and add perlite?

So i have 6 seedlings about 2-3wks old.
I started in jiffy pellets and everything was good, lots of roots showing out jiffy pellets so i transplanted into 3" pots sept 17.(watered)
1/2 promix bx and 1/2 promix hp
I watered once and seemed ok, waited until very light pots then watered again sept 21.
Seedlings started to droop n yellow. Waited til dry then watered again sept 21.
Now theyre browning n still drooping.

So i know i shoulda added more perlite and need to fix.

QUESTION- should i ride it out n just make sure they go fully dry for a day or two before watering again?
OR - should i pull em and re-plant w added perlite? If so, do i get old dirt off roots and plant in same pots or just move to slightly bigger pots and add perlite?

Any help is appreciated
Thx

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Or should i pull the jiffy pellets out n replant in better mix?(w perlite)
If i do this there will be some root damage.

Or should i pull the jiffy pellets out n replant in better mix?(w perlite)
If i do this there will be some root damage.

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So far only suggestion is that they need feed.
Does that make sense??
If so then they needed fed at like 1 week old?(issues started then and been getting progressively worse.
Heres pics from last night. I checked a cpl roots n they seem to be good and growing.

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I'm pretty sure it was an over watering problem but a few of the leaves stared spiraling and crinkling on the end of leaves. The worst one even developed a small hole in it. O let em dry for about 5 days and they started to perk. Back up. Everything i see says water em until a little comes out of the bottom, that's what I did and they didn't seem to like it. No discoloration was happening at all just twisting and crinkling leaves

So far only suggestion is that they need feed.
Does that make sense??
If so then they needed fed at like 1 week old?(issues started then and been getting progressively worse.
Heres pics from last night. I checked a cpl roots n they seem to be good and growing.

Anyone know what the hell is wrong with my baby auto blue diesel she's dying the other 2 which are haze are going great hydroponic no nutrients yet light is 300 watt led temps stay low 80s I really can't see the problem plus light is 20 inches away from the little girls

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First grow here. Looks like my three girls are getting a slight browning st their tips. Two are in veg, and one is in flower. My pH is about 7 and I'm not using any nutrients other than fox farm ocean forest soil.